M89. PHARMACOLOGICAL INTERVENTIONS FOR SMOKING CESSATION AMONG PEOPLE WITH SCHIZOPHRENIA: A SYSTEMATIC REVIEW AND META-ANALYSIS

BACKGROUND: People living with schizophrenia are 3 times more likely to smoke than the general population, and have fewer and less successful quitting attempts. In concert with psychosocial quit interventions, there is a need for evidence based pharmacological interventions to assist people living with schizophrenia achieve smoking abstinence. METHODS: We systematically searched PubMed, PsycInfo, EMBASE and Cochrane for randomised controlled trials of pharmacological interventions for reducing smoking among people living with schizophrenia. We conducted pairwise and network meta-analyses of effectiveness of interventions for achieving abstinence and reduction in smoking. We also examined psychiatric and physical adverse events of interventions. RESULTS: Nineteen studies were included in the systematic review. Data was available for buproprion, varenicline and nicotine replacement therapy (NRT). Buproprion (RR 3.4, 95%CI 1.6–7.3, p=0.002), varenicline (RR 3.8, 95%CI 2.0–7.2, p<0.001) and NRT (RR 4.3, 95%CI 1.7–10.7, p=0.002) were all associated with increased rates of abstinence in pairwise meta-analyses. In a network meta-analysis varenicline was superior to buproprion (RR 2.0, 95%CI 1.0–3.9), however there was no statistically significant difference between varenicline and NRT or buproprion and NRT. Varenicline was associated with higher rates of nausea than placebo. DISCUSSION: Buproprion, varenicline and NRT were all superior to placebo for achieving abstinence. Varenicline appears to be superior to buproprion for achieving abstinence, however varenicline is associated with higher rates of nausea.